Hi everyone! I just bought a new 12 volt deep cycle battery. Arrived at the site at dark, nothing works. I have two small kids and we were depending on the lights working :-(. Saw there was a blown 20amp fuse on the inside panel. I replaced it, but to no avail. The 30amp fuse at the battery seems fine. Any ideas? I'm at a site with no access to power. The battery is at full power...12.79.